High temperature amine-stabilized DCD and/or alkyl thiophosphoric triamide solvent systems and use in agricultural applications

Abstract

An inhibitor composition contains alkyl thiophosphoric triamide (or a mixture of alkyl thiophosphoric triamide and dicyandiamide), dissolved in a liquid medium comprising at least one organic solvent and at least one amine stabilizer, is useful in making fertilizer compositions and in a method of fertilizing target plants.

What is claimed is: 
     
       1. A high temperature stable liquid agricultural composition comprising:
 45 wt. % to 55 wt. % of N-(n-butyl)-thiophosphoric triamide (NBPT); 
 dimethylsulfoxide; 
 1 wt. % to 5 wt. % of a stabilizer consisting of (methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate, and 
 optionally, at least one solvent selected from the group consisting of:
 (a) at least one dioxolane compound of formula (I.b): 
 
 
       
         
           
           
               
               
           
         
         wherein R 6  and R 7  individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10; 
         b) at least one dibasic ester; 
         c) at least one compound of formula (III):
   R 3 OOC-A-CONR 4 R 5   (III),
 
 
         wherein R 3  comprises a C 1 -C 36  alkyl group; wherein R 4  and R 5  individually comprise a C 1 -C 36  alkyl group, wherein R 4  and R 5  can optionally together form a ring; and wherein A is a linear or a branched divalent C 2 -C 6  alkyl group; 
         d) at least one alkyldimethylamide; 
         e) at least one alkyl lactate; 
         f) ethyl levulinate; 
         g) at least one alkyoxyalcohol, ether alcohol, or alcohol; 
         h) at least one glycerine or glycerine derivative; 
         i) at least one alkylene carbonate; and 
         j) organophosphate of formula (I.a): 
       
       
         
           
           
               
               
           
         
         wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group; and 
         wherein the wt. % are based on a total weight of the composition. 
       
     
     
       2. The liquid agricultural composition of  claim 1 , wherein the stable liquid agricultural composition consists of
 45 wt. % to 55 wt % of the N-(n-butyl)-thiophosphoric triamide (NBPT), and 
 at least 2 wt. % to less than 3 wt. % of the stabilizer consisting of the (methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate, and optionally the at least one solvent, wherein the wt. % are based on a total weight of the composition; and 
 the dimethylsulfoxide. 
 
     
     
       3. The liquid agricultural composition of  claim 1 , wherein the N-(n-butyl)-thiophosphoric triamide (NBPT) is present in an amount between 45 wt. % and less than about 50 wt. %, based on a total weight of the composition. 
     
     
       4. The liquid agricultural composition of  claim 1 , wherein the stabilizer is present in an amount between 1 wt. % and 3 wt. % based on a total weight of the composition. 
     
     
       5. The liquid agricultural composition of  claim 1 , wherein the at least one solvent is present and comprises the organophosphate of formula (I.a): 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group. 
     
     
       6. A method of stabilizing a liquid fertilizer composition at high temperatures comprising contacting one or more nitrogenous fertilizer compounds with the high temperature stable liquid agricultural composition of  claim 1 . 
     
     
       7. The method of  claim 6 , wherein the N-(n-butyl)-thiophosphoric triamide (NBPT) is present in an amount between 45 and 50 wt. % by weight of the liquid inhibitor composition. 
     
     
       8. A concentrated liquid fertilizer composition comprising, based on 100 parts by weight of the composition: 
       (a) up to about 99 parts by weight of one or more nitrogenous fertilizer compounds, and 
       (b) the high temperature stable liquid agricultural composition of  claim 1 . 
     
     
       9. The concentrated liquid fertilizer composition of  claim 8 , wherein the at least one said solvent is:
 at least one dioxolane compound of formula (II.b): 
 
       
         
           
           
               
               
           
         
         wherein R 6  and R 7  individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10. 
       
     
     
       10. The concentrated liquid fertilizer composition of  claim 8 , wherein the at least one said solvent is:
 at least one dioxolane compound of formula (II.b) 
 
       
         
           
           
               
               
           
         
       
       wherein R 6  and R 7  individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10; and
 organophosphate of formula (I.a): 
 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group. 
     
     
       11. The concentrated liquid fertilizer composition of  claim 8 , wherein the at least one said solvent is organophosphate of formula (I.a): 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group. 
     
     
       12. A high temperature stable liquid agricultural composition comprising:
 45 wt. % to 55 wt. % of N-(n-butyl)-thiophosphoric triamide (NBPT); 
 1 wt. % to 5 wt. % of a stabilizer consisting of (methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate, and 
 optionally, at least one solvent selected from the group consisting of: 
 (a) at least one dioxolane compound of formula (I.b): 
 
       
         
           
           
               
               
           
         
         wherein R 6  and R 7  individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10; 
         b) at least one dibasic ester; 
         c) at least one compound of formula (III):
   R 3 OOC-A-CONR 4 R 5   (III),
 
 
       
       wherein R 3  comprises a C 1 -C 36  alkyl group; wherein R 4  and R 5  individually comprise a C 1 -C 36  alkyl group, wherein R 4  and R 5  can optionally together form a ring; and wherein A is a linear or a branched divalent C 2 -C 6  alkyl group;
 d) at least one alkyldimethylamide; 
 e) at least one alkyl lactate; 
 f) ethyl levulinate; 
 g) at least one alkyoxyalcohol, ether alcohol, or alcohol; 
 h) at least one glycerine or glycerine derivative; 
 i) at least one alkylene carbonate; and 
 j) organophosphate of formula (I.a): 
 
       
         
           
           
               
               
           
         
         wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group; and 
         wherein the wt. % are based on a total weight of the composition, 
         and no dimethylsulfoxide is present in the composition. 
       
     
     
       13. The liquid agricultural composition of  claim 12 , wherein the stable liquid agricultural composition consists of:
 45 wt. % to 55 wt % of N-(n-butyl)-thiophosphoric triamide (NBPT), 
 2 wt. % to less than 3 wt. % of the stabilizer; 
 and 
 the at least one solvent. 
 
     
     
       14. The liquid agricultural composition of  claim 13 , wherein the at least one solvent is present and consists of at least one dioxolane compound of formula (II.b): 
       
         
           
           
               
               
           
         
       
       wherein R 6  and R 7  individually is a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10. 
     
     
       15. A method of stabilizing a liquid fertilizer composition at high temperatures comprising contacting one or more nitrogenous fertilizer compounds with the high temperature stable liquid agricultural composition of  claim 12 . 
     
     
       16. The method of  claim 15 , wherein the stabilizer is present at least 2 to less than 3 wt. %. 
     
     
       17. The method of  claim 15 , wherein the stabilizer is present in an amount between 1 wt. % and 3 wt. %. 
     
     
       18. The method of  claim 15 , wherein the stabilizer is present in an amount between 2 wt. % and 3 wt. %. 
     
     
       19. A method of making a solid or concentrated liquid fertilizer composition comprising contacting one or more nitrogenous fertilizer compounds with the high temperature stable liquid agricultural composition of  claim 1 . 
     
     
       20. The method of  claim 19 , wherein the solvent comprises at least one member of the group consisting of: 
       organophosphate of formula (I.a): 
       
         
           
           
               
               
           
         
         wherein R 1 , R 2  and R 3 , are each independently chosen from a C 1 -C 16  alkyl group, a C 1 -C 16  alkenyl, group, a C 1 -C 16  alkoxyalkyl group, a C 7 -C 30  alkylarylalkyl group, a C 7 -C 30  arylalkyl group, or an aryl group and 
         at least one dioxolane compound of formula (II.b): 
       
       
         
           
           
               
               
           
         
         wherein R 6  and R 7  individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10. 
       
     
     
       21. The method of  claim 19 , wherein the liquid inhibitor composition consists of:
 45 wt. % to 55 wt. % of the N-(n-butyl)-thiophosphoric triamide (NBPT), and at least 2 wt. % to less than 3 wt. % of the stabilizer. 
 
     
     
       22. A high temperature stable liquid agricultural composition consisting of:
 at least one urease inhibitor, wherein the urease inhibitor is N-(n-butyl)-thiophosphoric triamide (NBPT); 
 dimethylsulfoxide; and 
 at least one stabilizer, wherein said stabilizer is 2-(2-aminoethoxy) ethanol.